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13-t=(-t)+7
We simplify the equation to the form, which is simple to understand
13-t=(-t)+7
Remove unnecessary parentheses
13-t=-t+7
We move all terms containing t to the left and all other terms to the right.
-1t+1t=+7-13
We simplify left and right side of the equation.
t=-6
0=-6
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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